Combination hand and machine gas cutting apparatus



H. NASS Oct. 22, 1935.

COMBINATION HAND AND MACHINE GAS CUTTING APPARATUS 2 Sheets-Sheet 1Filed Oct. 26, 1934 Ham/are /Vds.s

INVENTOR Oct. 22, 1935. v H. NASSY 2,018,378

COMBINATION HAND AND MACHINE GAS CUTTING APPARATUS Filed Oct. 26. 19:542 Sheets-Shet 2 Hal/yard Nlss INVENTOR Patented Oct. 22, 1935.CbltlBINATION HAND AND MACHINE GAS CUTTING APPARATUS Hallvard Niss,Moss, Norway, assignor to Magnus Bjorndal, Jersey City, N. J.

Application october 26, 1934, Serial No. 750,118

7 Claims.

This invention relates to improvements in the hand-driven type of gascutting machines. Such machines have hitherto always included specialspeed regulating and indicating means as well as electric motors fordriving. In addition the known machines of this type usually requirespecial torches unsuitable for hand use which altogether makes themexpensive and cumbersome in operation and thus unsuitable for smallerfactories and repair shops where flexibility and low price is firstconsideration.

, The object of my invention is,'therefore, first to combine anystandard hand torch with a light, inexpensive machine ina manner whichwill permit'the use of the hand torch as such at any time and with theleast possible work in changing from hand to machine gas cutting. Afurther object of my invention is to provide a hand-driven machine whichdoes not require a speed governor and which nevertheless will be easy tooperate at the correct speed and thusgive as good cutting results as amore elaborate machine with speed regulating devices. A still furtherobject of my invention is to provide a machine which without 25 anyelaborate adjustments will cut holes as well as outside radius fromabout 60 millimeters to 6 meters radius. Another object of my inventionis to provide a machine which can use a common angle iron or channelasthe guiding rail for straight cuts, such cuts may therefore be made ofany length without any trouble as suitable guide rails will be availablein any shop thus eliminating the costly guide rails required with theolder type machines. A still further object of my invention is toprovide a machine which will cut straight and circular bevels ofany=length and any radius. Another object of this invention is toprovide an attachment to the torch for keeping the torch at a constantdistance. away from the plate in cutting plates of uneven surface. Otherobjects of my invention will be evident from the following specificationand claims.

I attain these objects by a machine as shown in the accompanyingdrawings.in which:-.-

Fig. 1 is a side elevation of a machine embodying my invention. Fig. 2is a plan view of the same machine. Fig. 3 is an end view of thismachine, along iine',3-3 in'Fig. 1.

" ig." 4 is an enlarged end elevation of the torch it for cuttingbevels. I Fig. 5 is an enlarged partial elevation along line 5-.-- 5, inFig. 1. I g.;. shows an end view of the clamping fixure taken along line6--6 in Fig. 2. Fig. 7 is a sidewiew of the slidable center taken alongline 1-1 in Fig. 2.

similar numerals. refer to similar parts throughout the several views.The carriage l8 issupported on two wheels I I as InNorway November 20,1933 illustrated in Figures 1, 2 and 3. A third wheel I2 is the drivingwheel having a knurled surface for better gripping of thesupport. Theshaft 13 of the gear 12 extends into the box Ma which contains asuitable gear reduction, which may 5 preferably be a standard worm gearI30, connecting said shaft 13 with shaft 14 at right angles with same.The upper end of said shaft I4 supports a flywheel 15 with a handle I6.In Fig. 2

is indicated how the handle 16 may be shifted to hole I! for obtainingdifferent speeds.

Referring to Figures 1 and 2, one end of the .carriage I8 is formed as abracket l8 which supports a transverse slide rest IS on which a slide 20-'is operable transverselly back and forth by a knurled head screw 2|.The slide supports a vertical slide rest 22 supporting slide 23 which isoperable up and down by the knurled head screw 24. The back of slide 23is formed as a bushing 25 being a receptacle for the end of shaft 26 ex-20 tending horizontally away from the carriage I8. The end of said shaft26 is held securely in its receptacle 25 by set screw-21. The shaft 26may preferably be of a square or other regular sided cross section andit carries a longitudinally slid- 25 able clamping fixture 28 which maybe fixed in one position by tightening the screw 29. The clampingfixture 28 consists of three pieces, a centre block 28 and twoidentical, but opposing, clamps 28--a, and 28-h as shown in Fig. 6.Transversely through this clamping fixture 28 is mounted shaft 38 whichis also slidable in said fixture and may be fixed in one position byanother screw 29a on the under side of said fixture 28.

The shaft 30 may also preferably be of a square a cross section. v

The end of shaft' 30 is permanently fastened into a flange 3| againstwhich is rotatably mounted av flange 32, see Fig. 5. This flange 32 isrotatable on shaft 30 the end of which is turned down to a round'crosssection with a retaining ring 33 secured by pin 34 on its outer end.Holes 35 are provided in flange 3| into which fits the end of screw 36serving to hold flange 32 in a fixed position. By unscrewing 36 saidflange 32 may be rotated 180 and flxed there by screwing 36 into hole35. The flange 32 supports a clamp 31 which is split and may betightened by screw 38 around the split bushing 39. This split bushing 39is permanently fastenedon the torch 60, see Figures 1, 2, 3 and 5. InFig.5 the clamps are shown without the torch. By unscrewing 38 it isthus possible to quickly release torch 40 for hand work. The'splitbushing 39 may have an 5 inner hole suitably formed for the type oftorch to be used, whether this be of the single or multiple tube type.On one side of the split bushing 39 are engraved gradations which whenread against marks 4| on clamp 3jlwill give the angle for setting thetorch to cut bevels, see Figures sand 5. 1

In Fig. 4 is shown an attachment for holding the torch at a constantdistance when cutting plates of bent and uneven surfaces. Thisattachment consists of a disk wheel 42 rotatably mounted on a ring 43which is slidably mounted on torch 40 and may be fastened in place byscrew 44.

Referring to Figures 1, 2 and 3, handle bars 4! are provided for liftingand handling the machine. The guide rail 48 is shown in Figs. 1 and 3 asan angle iron, buta suitable channel iron may be used just as well. Acaster wheel 41 is provided for giving additional support to the machinein cutting holes orother circular cuts.

The operation ofmy machine is as follows: In setting up the machine forcutting straight cuts a suitable guide rail of the required length isselected. The plate to becut is marked up in regular fashion and theguide rail is laid on top in as nearly as possible correct position. Themachine is then placed on the rail and the torch is adjusted for roughadjustments bysliding clamp 28 on shafts 26 and 30. Fine adjustments aremade by operating the screws 2| and 24 of the compound slide rests. Theoperator now starts the torch and at the same time starts tumingflywheel l5 by crank it. Due to the friction of the worm gear connectingflywheel ii to drivewheel l2 and due to the inertia of the flywheel thecarriage it can not be pushed forward quickly by applying direct handpressure on the handle bars 45. A speed governor is therefore notnecessary as the speed may be regulated by the operator in turning thewheel ii by hand. If a higher speed is desired the handle it is placedin hole II. There is no advantage to be gained in driving this machineby motor as the operator must, be present watching the work anyway andthe manual labor is not strenuous. with this machine, in the simplemanner illustrated, bevels may be cut of any angle desired. These bevelsare necessary and very important in many welding operations.

Holes and circular cuts may be made by using shaft 3|! as a radius bar,a slidable center 48 being placed at suitable distance. The slidablecenter 48 is illustrated in detail in Fig. 7. It consists of a taperedbody with center pointv 48. a wing nut 49 and an eye bolt so whereby thecenter may be fixed in one spot on the shaft 30. For this operation noguide rail is required, the machine resting on the driving wheel l2 andthe caster wheel 41. For cutting holes of small radius the torch 40 isshifted over on the other side of shaft 26 by pulling shaft 30 out ofclamp 28 and inserting from the other side. The machine will thus travelon 'a radius larger than the one to be out and is thus easy to operateat the correct speed. Circular bevels can also be cut in the same manneras described, which together with straight bevel cutting is somethingwhich could not be accomplished by the older type machines.

It will thus be seen that there has been provided a simple, inexpensive,dependable and yet uniquely adjustable gas cutting machine. Althoughknown elements have been used throughout the new combination of theseelements is of a noveland valuable type capable of accomplishingsomething not previously possible. and well calculated to attain thevarious objects and advantages of the invention. .While variousparticularities of description. as to parts and shapings and relationshave been hereinabove detailed, this has been done in aid of disclosingas 5 clearly as possible an embodiment of the invention as nowpreferred; and it is tobe understood that these can be varied,apparently widely. within the appended claims. which define the scope ofthe protection contemplated. in

I claim as new and desire to secure by Letters Patent of the UnitedStates:

1. In a gas cutting machine the combination of a torch carriage havingon one side two grooved pulleys suitably mounted to' travel on anelevated guide rail; a knurled driving wheel mounted on the other sideof said carriage, a shaft connecting said driving wheel through asuitable gear reduction to a hand driven flywheel:

a compound slide rest mounted on one'end of said torch carriage, theoutermost slide carrying a rod extending longitudinally and horizontallyaway from said carriage; a sliding fixture mounted on said rod, atransverse r'od slidably mounted in said'flxture, means for fixing saidfixture and rods in a fixed position; a demountable torch clamprotatably mounted on the end of said transverse rod; a split bushingheld in said torch clamp, said split bushing being permanently mountedon a hand torch, said hand torch being held by said split bushing insaid torch clamp and extending longitudinally of the carrlageand beingadjustable in all directions.

2. A combination hand and machine gas cutting apparatus as described inclaim 1 where said split bushing mounted on said torch is rotatablymounted in said torch clamp andv supplied with gradations correspondingto a mark on said torch clamp whereby said torch may be adjusted forcuttingany angle bevels .desired. 4

3. A combination-hand and machine gas cutting apparatus as described inclaim 1 where a rotatable and demountable caster is mounted on'saidcarriage whereby a second support is furnistged when the machine is usedfor circular cu 4. A combination hand and machine gas cutting apparatusas described in claim 1 where said transverse rod is supplied with aslidably adjustable centre whereby the machine canbe used for cuttingcircular cuts.

' 5. A combination hand and machine gas cutting apparatus as describedin claim 1 where an adiustable wheel is mounted on the end-of said torchfor keeping the correct distance in cutcomprising three parts, a centralblock and two identical clamps holding respectively said 1011- gitudinaland transverse rods in a fixed position,

. one of said clamps being releasable to permit the removal andinsertion of said transverse rod from either side whereby holes of smallradius may be cut. 10

" namvann miss.

